nosoccermom, we do the conversions to hue/value/chroma notations here at The Land of Color. As I get groups of 'em done, I've been posting them e.g. I've done BenM Aura and all the BenM whites. Notation Tables over at The LoC Some paint brands do provide notations in the fandeck index, like Dunn-Edwards, California Paints, and the old Millenium Color Collection from Duron. All major paint brand's collections are tied to a hue/value/chroma color system, namely Munsell. An example where a major brand used notations is the Kelly Moore showroom in the San Francisco Design Center where they displayed each of their colors on the walls. The higher chroma colors are close to the entry, as an attractant, the more toned colors further along the wall. Then there are other brands like Pratt and Lambert where no one seems to know the collection they work with every day is based on a hue/value/chroma color system. So, from one extreme to the other and that explains (a little) why published color notations are hard to come by. You can use h/v/c notations to compare colors as long as the notations come from the same source. Because there's more than one way to do h/v/c conversions. No matter the method used to do the conversion, results are going to be *really* close. However, if you want to use notations for color comparisons, consistency is key and definitely need to use the same method. Which is why we do our own at The Loc. ~funcolors

I, too, can appreciate shiplap - but it doesn't match the style of your home, especially if you are adding crown molding! Honor the home's style - it's beautiful as is. Paint all the walls one color, white ceilings (or a very light mixture of the wall paint color).

It’s a neat architectural element in the house. Leave it. Once you get the arrangement done and other elements the ceiling will add to the drama of the room.

Sorry, it was late last night when I sent you the two links. I understand the hesitancy. Simply white is the right undertone, but may feel a bit too yellow, a bit too colorful when you are looking at samples vs looking at an entire wall. I also get that painting trim and ceilings is not inexpensive and something you don't want to make a mistake. @Beth H. : is one of the pros who posts often on Houzz and I believe I remember some posts from her where she stated that she had used White Dove and re-painted with Simply White. I think she used it on her Trim, Walls and Ceilings, but maybe she will see this post and chime in. There is not a color out there that works 100% of the time in every home. There is a reason that I didn't pick a ready formulated white and used the color match to icing. Although it is very slight, the difference between Simply White and Icing is that Simply White has a bit of gray added to the yellow, where Icing has orange. Both are very light whites, both give you a touch of warmth to soften the feeling, but I notice the slightest green tinge in Simply White that I don't see when I use Icing. Simply White would be my first choice if I had to choose a white from one of the stock formula whites from BM or SW. I am not sure that anyone would see a difference if I would have chosen Simply White instead of Icing, but my OCD took over the decision making process. Here are two photos of my foyer using BM Frosted Toffee (walls and ceiling) and Icing (door and trim).